It was no surprise the dramatic Coast Guard video quickly went viral.

Shot on a coast guardsman's helmet camera, the one-minute clip posted to the Department of Defense's imagery website captured the remarkable end of a June 18 high seas pursuit that ended with one team member leaping aboard a moving submersible and pounding on the hatch until suspected drug runners opened up.

But the story of how Coasties took down the so-called "narco sub" began about 12 hours before the video took place, according to Capt. James Estramonte, the commanding officer of U.S. Coast Guard Cutter Munro, the high endurance vessel credited with its seizure.

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